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v3.19.1

Investments Subject to Significant Influence and Equity Income (Variable Interest Entity) (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Consolidated Balance Sheets [Abstract] |  |  |
Assets, Current, Total | $ 2,832 | $ 2,526 |
Property, Plant and Equipment, Net | 18,712 | 16,995 |
Other Assets, Noncurrent, Total | 10,770 | 9,285 |
Assets, Total | 32,314 | 28,806 |
Liabilities, Current, Total | 4,553 | 3,946 |
Liabilities, Noncurrent, Total | 19,403 | 17,656 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total | 8,358 | 7,204 | $ 6,845
Liabilities and Equity, Total | 32,314 | 28,806 |
NSPML [Member] |  |  |
Consolidated Balance Sheets [Abstract] |  |  |
Assets, Current, Total | 86 | 225 |
Property, Plant and Equipment, Net | 1,690 | 1,720 |
Other Assets, Noncurrent, Total | 140 | 74 |
Assets, Total | 1,916 | 2,019 |
Liabilities, Current, Total | 21 | 180 |
Long-term Debt | 1,288 | 1,287 |
Liabilities, Noncurrent, Total | 62 | 42 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total | 545 | 510 |
Liabilities and Equity, Total | $ 1,916 | $ 2,019 |

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